Without knobs doors couldn’t open, hobs wouldn’t light, and hands wouldn’t have anything to grip. Shake things up with today's Groupon from Colquhoun’s. Choose from the following options:

• £11 for a set of door handles for one door (56% off)

• £49 for a set of door handles for five doors (61% off)

Opening the door to those wanting to open doors, Colquhoun’s has handed down its art of interior designs through five generations. This family business has been turning handles since 1928 with their showroom locked in the city centre. Door knobs from Victorian pieces to art-deco selections feature among their collections as well as doors themselves, with window fittings and sockets also swinging off the hinge.

Households can choose a set of handles for one door, or make a match of it with a set for five. The Mayfair Lever(£24.94) is available in polished or satin chrome with a curved shape for gripping. Alternatively The Kensignton Lever(£24.94) is available in polished chrome or satin brass, and provides a more stately example of a classic aesthetic with an angular design.